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Fetal Heart Block Monitoring — SCE Rheumatology MCQ

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HardSLE & Antiphospholipid SyndromeFetal Heart Block MonitoringSCE Rheumatology

A 28-year-old woman with SLE who is positive for anti-Ro/SSA and anti-La/SSB antibodies is 22 weeks pregnant. Expert fetal echocardiography confirms persistent prolongation of the mechanical atrioventricular interval to greater than 150 ms, consistent with first-degree atrioventricular block. Fetal heart rate, ventricular function and anatomy are normal, with no hydrops, effusion or endocardial fibroelastosis. What is the most appropriate next management?

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Correct answer: A — Arrange urgent multidisciplinary fetal medicine and paediatric cardiology review with closer serial fetal echocardiography; consider dexamethasone only on an individualised basis after counselling about the uncertain benefit and potential harms

Persistent mechanical AV-interval prolongation in an anti-Ro/La-exposed fetus requires prompt specialist reassessment and closer echocardiographic surveillance for progression or associated myocardial disease. Complete block can develop rapidly and is usually irreversible once established. Fluorinated corticosteroids cross the placenta, but evidence that dexamethasone prevents progression of incomplete block is conflicting; it should not be presented as mandatory therapy and may be considered only after multidisciplinary risk–benefit discussion. IVIG is not established first-line treatment. Normal ventricular function and absence of hydrops exclude any indication for delivery at 22 weeks, while first-degree block is not sufficiently benign to justify routine surveillance alone. Progression is not inevitable, so termination is inappropriate.

Reference: Ciardulli A et al. Fluorinated steroids are not superior to any treatment to ameliorate the outcome of autoimmune mediated congenital heart block: a systematic review and meta-analysis. Acta Obstetricia et Gynecologica Scandinavica. 2020. https://pubmed.ncbi.nlm.nih.gov/18195175/